Adaptec AHA-2740 User manual

AHA-2740/2742
Single-Channel
AHA-2740T/2742T
TwinChannel
EISA-to-Fast SCSI Host Adapters
User’s Manual
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page A-1)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93

Adaptec, Inc.
691 South Milpitas Boulevard
Milpitas, CA 95035
Copyright © 1993, Adaptec, Inc.
All rights reserved. Adaptec and the Adaptec logo
are registered trademarks of Adaptec, Inc.
Printed in Singapore
STOCKNO.: 510381-00 Rev. C LL 9/93
Information subject to change without notice.
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page A-2)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93

AHA-2740/2742
Single-Channel
AHA-2740T/2742T
TwinChannel
EISA-to-Fast SCSI Host Adapters
User’s Manual
▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-i)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93

Copyright
Copyright © 1993 Adaptec, Inc. All rights reserved. No part of this publication may
be reproduced, stored in a retrieval system, or transmittedin any form or by any
means; electronic, mechanical, photocopying, recording or otherwise,withoutthe
prior written consent of Adaptec, Inc., 691 South Milpitas Blvd., Milpitas, CA 95035.
Trademarks
All productnames mentioned belowand in this manual are trademarks orregistered
trademarksof theirrespectiveowners.
Adaptec and the Adaptec logo are registeredtrademarks, and AHA, TwinChannel,
and PhaseEngine are trademarks of Adaptec, Inc.
AT&T isa registered trademark of American Telephone and Telegraph Company.
Bernoulli is a registered trademark of Iomega Corporation.
IBM, OS/2, AT, andMicro Channel are registeredtrademarks of International Busi-
ness Machines Corporation.
MS-DOS is a registered trademark of Microsoft Corporation.
NetWare is a registered trademark of Novell, Inc.
SCO is a registered trademark of the Santa Cruz Operation, Inc..
UNIX is a registered trademark and USL is a trademark of Unix Systems Laboratories.
Changes
The material in this manual isfor information only and issubject to change without
notice. While reasonable efforts have been made in thepreparationof this manual to
assure its accuracy, Adaptec, Inc. assumes no liability resulting from errors or omissions
inthis manual, or from the use of the information containedherein.
Adaptec reserves the right to make changes in the product design without reservation
and without notification to its users.
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-ii)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
ii

FCC Compliance Statement
NOTE: This equipment has been testedand found to comply withthe limits for a
Class B digital device, pursuant to Part 15 of the FCCrules. These limits are
designed to provide reasonable protection against harmful interference in residential
installations. This equipment generates, uses, and can radiate radio frequency
energy, and if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur ina particular installation.
If this equipment does cause interference to radio or television equipment reception,
which can be determined by turning the equipment off and on, the user is encour-
aged to try to correct the interference by one or more of the following measures:
•Reorient or relocate the receiving antenna
•Move the equipment away from the receiver
•Plug the equipment into an outlet on a circuit different from that to
which the receiver is powered
•If necessary, the user should consult the dealer or an experienced
radio/television technician for additional suggestions
CAUTION: Only equipment certified to comply with Class B (computer input/output
devices, terminals, printers, etc.) should be attached to thisequipment, and must
have shielded interface cables.
Finally, any change or modifications to the equipment by the user not expressly
approved by the grantee or manufacturer could void the user’s authority to operate
such equipment.
Each AHA-2740 Series host adapter is equipped with an FCC compliance label
which shows only the FCC identification number. The full text of the associated label
follows:
This device complies with part 15of the FCC rules. Operation is subjectto the follow-
ing two conditions: (1) this device maynot cause harmful interference and (2) this
device must accept any interference received, including interference that may cause
undesired operation.
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-iii)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
iii

Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-iv)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93

Table of Contents
Preface
Inside This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
Advisories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
1
Introduction
About This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
The AHA-2740 Series of Host Adapters . . . . . . . . . . . . . . . . 1-3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Fast Data Transfer Rates . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Maximum Off-loading the Host CPU. . . . . . . . . . . . . . . 1-4
Fully Disk Array Capable . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Advanced Fast SCSI-2 Implementation. . . . . . . . . . . . . 1-5
Multiple Device and Applications Support . . . . . . . . . . 1-5
Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
The On-board Floppy Controller
(AHA-2742/2742T Only) . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Unpacking and Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Adaptec Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
2
Getting Started
About This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
The Host Adapter and the SCSI Bus . . . . . . . . . . . . . . . . . . 2-4
Quick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Prepare Your SCSI Devices . . . . . . . . . . . . . . . . . . . . . . 2-5
Install Your Host Adapter and Peripherals. . . . . . . . . . 2-6
Configure the Host Adapter . . . . . . . . . . . . . . . . . . . . . . 2-7
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Termination on the SCSI Bus. . . . . . . . . . . . . . . . . . . . . 2-9
SCSI IDSetting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Board Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-v)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
v

SCSI Bus Activity LED Connector . . . . . . . . . . . . . . . 2-14
Connecting Peripherals . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Before Re-booting Your System. . . . . . . . . . . . . . . . . . 2-23
Reassemble the System . . . . . . . . . . . . . . . . . . . . . . . . 2-23
3
Configuring the Host Adapter
About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
The EISA Configuration Utility. . . . . . . . . . . . . . . . . . . . . . 3-3
Run the EISA Configuration Utility . . . . . . . . . . . . . . . 3-4
Copy Configuration and Overlay Files . . . . . . . . . . . . . 3-4
Select the Host Adapter . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Configure the Host Adapter Parameters . . . . . . . . . . . 3-5
BIOS and Device Configuration. . . . . . . . . . . . . . . . . . 3-12
Exit the EISA Configuration Utility . . . . . . . . . . . . . . 3-19
Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Disk Format Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Host Adapter Diagnostic Utility . . . . . . . . . . . . . . . . . 3-21
4
Troubleshooting
About This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
SCSI Troubleshooting Checklist . . . . . . . . . . . . . . . . . . . . . 4-3
Problems and Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Conflicts With Other Options. . . . . . . . . . . . . . . . . . . . . . . . 4-7
APPENDICES
A
Specifications
About This Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Technical Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Product Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Extended Industry-Standard Architecture Interface . . . . . A-4
SCSI Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Electrical Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Floppy Disk Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
Standard Electronic and Physical Interface . . . . . . . . . A-8
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-vi)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
AHA-2740 Series User’s Manual
vi

B
I/O Operating Environment
About This Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Host Adapter Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
DOS/Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
C
Optimizing Performance
About This Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Performance Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
Enabling Synchronous Negotiation . . . . . . . . . . . . . . . . C-3
Disabling the Host Adapter BIOS . . . . . . . . . . . . . . . . . C-3
Enabling SCSI Bus Parity . . . . . . . . . . . . . . . . . . . . . . . C-4
Setting Enable Disconnection. . . . . . . . . . . . . . . . . . . . . C-4
Send Start Unit Command. . . . . . . . . . . . . . . . . . . . . . . C-4
DOS/Windows Performance . . . . . . . . . . . . . . . . . . . . . . C-5
D
Disk Drives Over 1 Gigabyte
About This Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Extended Translation (Using DOS 5.0) . . . . . . . . . . . . . . . . D-3
The DOS 1 Gigabyte Limit . . . . . . . . . . . . . . . . . . . . . . . . . . D-3
When to Use Extended Translation . . . . . . . . . . . . . . . . . . . D-4
With DOS Version 5 Only. . . . . . . . . . . . . . . . . . . . . . . . D-4
Drives With Mixed Partitions. . . . . . . . . . . . . . . . . . . . . D-4
Using Fdisk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4
Questions and Answers About Extended Translation. . . . . D-5
Glossary
About This Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . Glossary-1
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Glossary-3
Index
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Index-1
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-vii)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
Table of Contents
vii

List of Figures
Figure 1-1. Host Adapter Board Layout . . . . . . . . . . . . . . . . 1-6
Figure 2-1. Connectors on the Host Adapter. . . . . . . . . . . . . 2-8
Figure 2-2. Internal and External Devices . . . . . . . . . . . . . . 2-9
Figure 2-3. Internal Devices Only . . . . . . . . . . . . . . . . . . . . 2-10
Figure 2-4. External Devices Only. . . . . . . . . . . . . . . . . . . . 2-10
Figure 2-5. SCSI LED Connector. . . . . . . . . . . . . . . . . . . . . 2-14
Figure 2-6. Connecting Cable to Internal Connector . . . . . 2-17
Figure 2-7. Connecting Cable to SCSI Device. . . . . . . . . . . 2-17
Figure 2-8. Connecting a Second Internal SCSI Device. . . 2-18
Figure 2-9. Connecting External Cable to Host Adapter. . 2-19
Figure 2-10. Connecting External Cable to SCSI Device. . 2-19
Figure 2-11. Connecting Multiple External SCSI Devices. 2-20
Figure 2-12. Connecting Floppy Cable to Host Adapter. . . 2-21
Figure 2-13. Connecting Floppy Cable to Floppy Drive. . . 2-22
Figure 2-14. Connecting a Second Floppy Drive. . . . . . . . . 2-22
Figure 3-1. Host Adapter Parameters. . . . . . . . . . . . . . . . . . 3-5
Figure 3-2. Selecting Interrupt Level . . . . . . . . . . . . . . . . . . 3-6
Figure 3-3. Selecting Bus Release Time . . . . . . . . . . . . . . . . 3-7
Figure 3-4. Selecting Data FIFO Threshold . . . . . . . . . . . . . 3-7
Figure 3-5. Selecting Host Adapter BIOS Base Address . . . 3-8
Figure 3-6. Selecting Host Adapter SCSI ID . . . . . . . . . . . . 3-9
Figure 3-7. Selecting SCSI Bus Parity . . . . . . . . . . . . . . . . 3-10
Figure 3-8. Selecting SCSI Selection Timeout . . . . . . . . . . 3-11
Figure 3-9. Selecting SCSI Bus Reset at Power-on . . . . . . 3-11
Figure 3-10. Configuring SCSI Bus Termination. . . . . . . . 3-12
Figure 3-11. BIOS and Device Configuration. . . . . . . . . . . 3-12
Figure 3-12. BIOS Configuration Selection. . . . . . . . . . . . . 3-13
Figure 3-13. SCSI Device Configuration. . . . . . . . . . . . . . . 3-15
Figure 3-14. Exiting SCSI Device Configuration . . . . . . . . 3-19
Figure 3-15. Utility Selection. . . . . . . . . . . . . . . . . . . . . . . . 3-20
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-viii)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
AHA-2740 Series User’s Manual
viii

List of Tables
Table 1-1. Host Adapter Components . . . . . . . . . . . . . . . . . . 1-7
Table 1-2. Host Adapter Default Settings. . . . . . . . . . . . . . . 1-7
Table 2-1. SCSI Device and AHA Configuration . . . . . . . . . 2-9
Table A-1. Standard EISA Bus Electronic and
Physical Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Table A-2. Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Table A-3. Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Table A-4. Internal Connector Pin Assignments . . . . . . . . A-6
Table A-5. External Connector Pin Assignments. . . . . . . . A-7
Table A-6. Output and Input Signals . . . . . . . . . . . . . . . . . A-8
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-ix)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
Table of Contents
ix

Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-x)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93

Preface
Inside This Manual
This manual provides complete instructions on how to install and
use the Adaptec AHA-2740 Series of EISA-to-Fast SCSI Host
Adapters.
Chapter 1, Introduction, provides general information about the
Adaptec AHA-2740 Series of host adapters. The features, board
layout, and default settings are included. It also tells you how to
contact Adaptec Technical Support.
Chapter 2, Getting Started, has the information needed to install
the host adapter and SCSI devices.
Chapter 3, Configuring the Host Adapter, describes the EISA
Configuration utility and how it is used to configure your host
adapter. The chapter also describes the utilities available through
the EISA Configuration utility.
Chapter 4, Troubleshooting, has information to assist you in
troubleshooting problems that may occur during installation and
configuration.
Appendix A, Specifications, lists technical specifications of the
host adapter and its connectors, which may be of use to the
advanced user or technician.
Appendix B, I/O Operating Environment, provides information
on using your host adapter with various operating systems, such
as DOS/Windows. A brief discussion on Adaptec’s EZ-SCSI I/O
Operating Environment Software is also included.
Appendix C, Optimizing Performance, has various tips on
maximizing the performance of your host adapter.
Appendix D, Disk Drives Over 1 Gigabyte, describes Adaptec’s
extended translation feature which allows you to bypass the DOS
1024 cylinder limit, and supports disk drives up to 8 Gigabytes
(GBytes) in size.
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-xi)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
xi

The Glossary has definitions of special terms used in this manual
and in SCSI literature in general.
The Index helps you locate specific information quickly.
Conventions
The following typographic conventions are used throughout this
User’s Manual.
bold
Used for keystrokes (.. press the Enter key ..) and screen selec-
tion fields (.. select Backup Device and ..).
Helvetica
Used for operator entry that must be typed exactly as shown
( .. device=c:\adaptec\aspidos.sys ..) and for screen messages
(..Enter Password ..).
Helvetica Italics
Used as a place holder for text you must determine and type in
(.. enter nn for number ..). Also used for program and file names
in body text (.. the
autoexec.bat file ..).
Italics
Used for emphasis (.. is only supported ..) and document reference
(.. refer to Chapter 2, Setting Up ..).
ALL CAPITALS
Used for acronyms, such as SCSI and CD-ROM.
Hexadecimal Numbers
Are followed by an ‘h’, e.g., 330h.
Numbered Step Marker
The ➤symbol marks the first in a series of numbered steps.
End Mark
The
❒symbol marks the end of the text for each chapter.
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-xii)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
AHA-2740 Series User’s Manual
xii

Advisories
Advisories are quick notes that stress an important point or warn
of a potential hazard to the system, data, and/or the user. This
manual uses three types of advisories which are as follows:
Note
Text set off in this way presents reminder, tips, or suggestions
which may simplify the assembly and use of the host adapter.
Caution
Failure to observe this type of advisory could result in damage
to your system, devices, and/or data.
WARNING
This type of advisory is a visual alarm. Failure to
observe this type of advisory could result in injury to
the user.
❒
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-xiii)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
Preface
xiii

Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-xiv)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93

Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 0-x)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93

1
Introduction
About This Chapter
Read this chapter to find out:
•An overview of the AHA-2740 Series of EISA-to-Fast
SCSI host adapters
•The features of the AHA-2740 Series
•The layout of the host adapter and all its major
components
•The default settings of the host adapter and how to
disable or enable the on-board floppy controller
•How to get help from Adaptec Technical Support
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 1-1)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
1-1

Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 1-2)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93

1
Overview
This user’s manual provides information on how to install and
configure the AHA-2740 and AHA-2742 single-channel, and the
AHA-2740T and AHA-2742T TwinChannelEISA-to-Fast SCSI
host adapters in an EISA computer system.
The AHA-2740 and AHA-2742 support a single SCSI channel
(SCSI Channel A), while the AHA-2740T and AHA-2742T sup-
port Adaptec’s TwinChannel (SCSI Channel A and SCSI Channel
B) architecture. Procedures for all adapters are the same except
when regarding the on-board floppy controller on both the
AHA-2742 and AHA-2742T.
In this manual, the AHA-2740 and AHA-2742 are referred to
jointly as the AHA-2740/2742 host adapter; the AHA-2740T and
AHA-2742T are referred to jointly as the AHA-2740T/2742T host
adapter. Cumulatively, all four host adapters are referred to as
the AHA-2740 Series.
The AHA-2740 Series of Host Adapters
The AHA-2740 Series provides a high performance connection
between the EISA (Extended Industry Standard Architecture)
bus and the SCSI (Small Computer System Interface) bus. The
AHA-2740 Series is a bus master device that transfers data into
host memory at burst rates of 33 MBytes/sec. These transfers are
generally 32 bits wide, except when transferring data into 8- or
16-bit memory.
Bus mastering minimizes host CPU overhead, since the AHA-
2740 Series has an on-board sequencer (SCSI PhaseEngine)
that allows it to independently manage data transfer between
SCSI devices and the computer system memory, without requir-
ing the involvement of the CPU. This is the highest performance
type of data transfer available for the EISA bus in multi-tasking
operating systems.
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 1-3)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
1-3